Miss Piggy is decked out in a dress made of recycled plastic, with her unusual engagement ring. "I think it was charcoal," she says. / Jay Maidment, Disney

by Bryan Alexander, USATODAY

by Bryan Alexander, USATODAY

Forget Brad and Angelina or Ashton and Mila. The biggest buzz this year over a possible celeb wedding concerns a pig and a frog.

Miss Piggy and Kermit appear to hit the altar in Muppets Most Wanted, opening Friday. Speculation about the union soared after pictures hit the Internet last month of a radiant Miss Piggy in a Vivienne Westwood wedding dress. Newly released pictures show Kermit in a morning suit.

On the eve of the film's opening, the world's most famous mixed-species couple happily discuss (with the assistance of puppeteers Eric Jacobson and Steve Whitmire) the fuss over the wedding talk.

"We are the ultimate love story," Miss Piggy says.

"I think people have a romantic view of us, sometimes a strange obsession - we're a frog and a pig," Kermit adds. "And we've outlasted everyone in Hollywood."

The two have had their ups and downs in a relationship that has lasted nearly 40 years, through TV's The Muppet Show and eight Muppet movies.There have also been close marital calls. In 1984's The Muppets Take Manhattan, the couple were supposed to perform a wedding onstage, and Miss Piggy switched out the actor playing the vicar for a real vicar.

"There is actually some debate about whether they are actually really married after that," says Most Wanted director and screenwriter James Bobin.

In 2011's The Muppets, they appeared to be married and living happily ever after in a dream sequence (of Miss Piggy). Bobin was so enamored of the wedding concept that he called for an even bigger event in the new film. The proposal and wedding prep might stem from a devious Kermit look-alike named Constantine, but it's Kermit who ends up standing up with his pig.

Among the details the couple is willing to reveal:

â?¢ The dress. "Vivie (Westwood) made moi the most exquisite dress," Miss Piggy says. Even if it is made entirely of recycled plastic. "It smelled like milk cartons," Kermit says. "Very strange. But she truly looks beautiful."

â?¢ The ring. Miss Piggy's engagement ring - a single large, dark stone - might not have been the prettiest choice. "Me being excited about the ring, that was acting," she says. "I think it was charcoal."

â?¢ The suit. Kermit (and his look-alike, Constantine) dons a specially made Brooks Brothers morning suit. "I don't wear a lot of clothes, so it's nice to get something that fits," he says. "I cannot buy off the rack.''

â?¢ The location. The Tower of London setting doesn't quite draw the crowds who camped out for William and Kate's wedding across town in 2011. But there are plenty of well-wishers on hand as Miss Piggy rolls up in a classic white Rolls-Royce.

And though the tower might seem to be an unusual venue, "many men might say it's perfect," Kermit says. "You're right near the torture devices."

Does the wedding go off? That might be asking too much when it comes to a commitment-phobic amphibian.

"I'm a frog," Kermit says. "I always have cold flippers. I have no problem with the institution of marriage. I think it's good for certain folks."

But, he adds, "no matter what, Miss Piggy and I are in a long-term, committed relationship that's gone on for many, many years."